dms/endpoint: Fix bug where KMS key ignored

[YakDriver]

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Closes #23143
Relates #19040

Output from acceptance testing:

% make testacc TESTS=TestAccDMSEndpoint PKG=dms 
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/dms/... -v -count 1 -parallel 20 -run='TestAccDMSEndpoint'  -timeout 180m
--- PASS: TestAccDMSEndpoint_MongoDB_basic (35.44s)
--- PASS: TestAccDMSEndpoint_Oracle_secretID (36.88s)
--- PASS: TestAccDMSEndpoint_PostgreSQL_secretID (36.97s)
--- PASS: TestAccDMSEndpoint_PostgreSQL_kmsKey (39.08s)
--- PASS: TestAccDMSEndpoint_PostgreSQL_basic (39.87s)
--- PASS: TestAccDMSEndpoint_Oracle_basic (40.46s)
--- PASS: TestAccDMSEndpoint_docDB (44.71s)
--- PASS: TestAccDMSEndpoint_db2 (44.90s)
--- PASS: TestAccDMSEndpoint_Oracle_update (45.01s)
--- PASS: TestAccDMSEndpoint_OpenSearch_fullLoadErrorPercentage (46.87s)
--- PASS: TestAccDMSEndpoint_OpenSearch_errorRetryDuration (46.98s)
--- PASS: TestAccDMSEndpoint_OpenSearch_basic (46.98s)
--- PASS: TestAccDMSEndpoint_S3_extraConnectionAttributes (46.98s)
--- PASS: TestAccDMSEndpoint_OpenSearch_extraConnectionAttributes (47.24s)
--- PASS: TestAccDMSEndpoint_kafka (57.16s)
--- PASS: TestAccDMSEndpoint_basic (57.18s)
--- PASS: TestAccDMSEndpoint_PostgreSQL_update (57.51s)
--- PASS: TestAccDMSEndpoint_dynamoDB (59.68s)
--- PASS: TestAccDMSEndpoint_MongoDB_update (59.91s)
--- PASS: TestAccDMSEndpoint_kinesis (77.51s)
--- PASS: TestAccDMSEndpoint_S3_basic (54.48s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/dms	91.495s

[ewbankkit]

LGTM 🚀.

% make testacc TESTS=TestAccDMSEndpoint_ PKG=dms ACCTEST_PARALLELISM=5
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/dms/... -v -count 1 -parallel 5 -run='TestAccDMSEndpoint_'  -timeout 180m
=== RUN   TestAccDMSEndpoint_basic
=== PAUSE TestAccDMSEndpoint_basic
=== RUN   TestAccDMSEndpoint_S3_basic
=== PAUSE TestAccDMSEndpoint_S3_basic
=== RUN   TestAccDMSEndpoint_S3_extraConnectionAttributes
=== PAUSE TestAccDMSEndpoint_S3_extraConnectionAttributes
=== RUN   TestAccDMSEndpoint_dynamoDB
=== PAUSE TestAccDMSEndpoint_dynamoDB
=== RUN   TestAccDMSEndpoint_OpenSearch_basic
=== PAUSE TestAccDMSEndpoint_OpenSearch_basic
=== RUN   TestAccDMSEndpoint_OpenSearch_extraConnectionAttributes
=== PAUSE TestAccDMSEndpoint_OpenSearch_extraConnectionAttributes
=== RUN   TestAccDMSEndpoint_OpenSearch_errorRetryDuration
=== PAUSE TestAccDMSEndpoint_OpenSearch_errorRetryDuration
=== RUN   TestAccDMSEndpoint_OpenSearch_fullLoadErrorPercentage
=== PAUSE TestAccDMSEndpoint_OpenSearch_fullLoadErrorPercentage
=== RUN   TestAccDMSEndpoint_kafka
=== PAUSE TestAccDMSEndpoint_kafka
=== RUN   TestAccDMSEndpoint_kinesis
=== PAUSE TestAccDMSEndpoint_kinesis
=== RUN   TestAccDMSEndpoint_MongoDB_basic
=== PAUSE TestAccDMSEndpoint_MongoDB_basic
=== RUN   TestAccDMSEndpoint_MongoDB_update
=== PAUSE TestAccDMSEndpoint_MongoDB_update
=== RUN   TestAccDMSEndpoint_Oracle_basic
=== PAUSE TestAccDMSEndpoint_Oracle_basic
=== RUN   TestAccDMSEndpoint_Oracle_secretID
=== PAUSE TestAccDMSEndpoint_Oracle_secretID
=== RUN   TestAccDMSEndpoint_Oracle_update
=== PAUSE TestAccDMSEndpoint_Oracle_update
=== RUN   TestAccDMSEndpoint_PostgreSQL_basic
=== PAUSE TestAccDMSEndpoint_PostgreSQL_basic
=== RUN   TestAccDMSEndpoint_PostgreSQL_secretID
=== PAUSE TestAccDMSEndpoint_PostgreSQL_secretID
=== RUN   TestAccDMSEndpoint_PostgreSQL_update
=== PAUSE TestAccDMSEndpoint_PostgreSQL_update
=== RUN   TestAccDMSEndpoint_PostgreSQL_kmsKey
=== PAUSE TestAccDMSEndpoint_PostgreSQL_kmsKey
=== RUN   TestAccDMSEndpoint_docDB
=== PAUSE TestAccDMSEndpoint_docDB
=== RUN   TestAccDMSEndpoint_db2
=== PAUSE TestAccDMSEndpoint_db2
=== CONT  TestAccDMSEndpoint_basic
=== CONT  TestAccDMSEndpoint_db2
=== CONT  TestAccDMSEndpoint_docDB
=== CONT  TestAccDMSEndpoint_kinesis
=== CONT  TestAccDMSEndpoint_PostgreSQL_kmsKey
--- PASS: TestAccDMSEndpoint_PostgreSQL_kmsKey (102.32s)
=== CONT  TestAccDMSEndpoint_Oracle_update
--- PASS: TestAccDMSEndpoint_docDB (125.59s)
=== CONT  TestAccDMSEndpoint_PostgreSQL_update
--- PASS: TestAccDMSEndpoint_db2 (138.86s)
=== CONT  TestAccDMSEndpoint_PostgreSQL_secretID
--- PASS: TestAccDMSEndpoint_basic (182.56s)
=== CONT  TestAccDMSEndpoint_OpenSearch_extraConnectionAttributes
--- PASS: TestAccDMSEndpoint_PostgreSQL_secretID (68.82s)
=== CONT  TestAccDMSEndpoint_PostgreSQL_basic
--- PASS: TestAccDMSEndpoint_PostgreSQL_update (82.78s)
=== CONT  TestAccDMSEndpoint_Oracle_basic
--- PASS: TestAccDMSEndpoint_Oracle_update (113.96s)
=== CONT  TestAccDMSEndpoint_Oracle_secretID
--- PASS: TestAccDMSEndpoint_kinesis (218.01s)
=== CONT  TestAccDMSEndpoint_OpenSearch_fullLoadErrorPercentage
--- PASS: TestAccDMSEndpoint_Oracle_basic (33.50s)
=== CONT  TestAccDMSEndpoint_kafka
--- PASS: TestAccDMSEndpoint_PostgreSQL_basic (35.90s)
=== CONT  TestAccDMSEndpoint_MongoDB_update
--- PASS: TestAccDMSEndpoint_Oracle_secretID (49.79s)
=== CONT  TestAccDMSEndpoint_OpenSearch_errorRetryDuration
--- PASS: TestAccDMSEndpoint_OpenSearch_fullLoadErrorPercentage (74.94s)
=== CONT  TestAccDMSEndpoint_MongoDB_basic
--- PASS: TestAccDMSEndpoint_kafka (51.76s)
=== CONT  TestAccDMSEndpoint_S3_extraConnectionAttributes
--- PASS: TestAccDMSEndpoint_OpenSearch_extraConnectionAttributes (115.70s)
=== CONT  TestAccDMSEndpoint_OpenSearch_basic
--- PASS: TestAccDMSEndpoint_MongoDB_update (69.63s)
=== CONT  TestAccDMSEndpoint_S3_basic
--- PASS: TestAccDMSEndpoint_OpenSearch_errorRetryDuration (70.78s)
=== CONT  TestAccDMSEndpoint_dynamoDB
--- PASS: TestAccDMSEndpoint_OpenSearch_basic (58.57s)
--- PASS: TestAccDMSEndpoint_MongoDB_basic (72.03s)
--- PASS: TestAccDMSEndpoint_S3_extraConnectionAttributes (96.10s)
--- PASS: TestAccDMSEndpoint_S3_basic (131.88s)
--- PASS: TestAccDMSEndpoint_dynamoDB (151.90s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/dms	492.372s

[github-actions]

This functionality has been released in v4.4.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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